There are several ways to view disk usage in your Linux system, and that is what we would be going over in this guide...
Out of the box, Linux provides us the df command, which is the standard Unix command used to display the amount of available disk space for file systems.
To view the disk usage information, run the dfcommand:
user@server: df
Filesystem 1K-blocks Used Available Use% Mounted on
udev 489564 0 489564 0% /dev
tmpfs 100872 3024 97848 3% /run
/dev/vda1 25786076 3066240 21647452 13% /
tmpfs 504360 0 504360 0% /dev/shm
tmpfs 5120 0 5120 0% /run/lock
tmpfs 504360 0 504360 0% /sys/fs/cgroup
tmpfs 100872 0 100872 0% /run/user/0
This above is measured in bytes, to get a human readable format, you use df with the -h option, so, df -h gives us:
user@server: df -h
Filesystem Size Used Avail Use% Mounted on
udev 479M 0 479M 0% /dev
tmpfs 99M 3.0M 96M 3% /run
/dev/vda1 25G 3.0G 21G 13% /
tmpfs 493M 0 493M 0% /dev/shm
tmpfs 5.0M 0 5.0M 0% /run/lock
tmpfs 493M 0 493M 0% /sys/fs/cgroup
tmpfs 99M 0 99M 0% /run/user/0
It shows you the filesystem, its size, how much space is used, how much is available, how much percentage is being used (used percentage), and the filesystem the device is mounted on.
The output will look differently depending on the types of disks and mount points on your system, for example, /dev/vda1 is my disk storage, it might be different for you, e.g you might see /dev/sda and so on.
Enjoy!